A SURVEY OF NEBULAE AROUND GALACTIC WOLF-RAYET STARS IN THE SOUTHERN SKY .2.

Citation
Ap. Marston et al., A SURVEY OF NEBULAE AROUND GALACTIC WOLF-RAYET STARS IN THE SOUTHERN SKY .2., The Astrophysical journal. Supplement series, 95(1), 1994, pp. 151
Citations number
19
Categorie Soggetti
Astronomy & Astrophysics
ISSN journal
00670049
Volume
95
Issue
1
Year of publication
1994
Database
ISI
SICI code
0067-0049(1994)95:1<151:ASONAG>2.0.ZU;2-6
Abstract
We present the second half of a CCD narrow-band imaging survey of gala ctic WoIf-Rayet stars located in the southern hemisphere as listed by van der Hucht et al. (1981). Images of 50 Wolf-Rayet stars were taken using a wide-field CCD and narrowband interference filters centered on H alpha and [O III] 5007 Angstrom wavelengths. The first half of the survey (Marston, Chu, and Garcia-Segura 1993, hereafter Paper I) revea led six new ring nebulae residing around Wolf-Rayet stars. Here we rev eal a possible 11 new rings and the existence of multiple rings associ ated with two previously known nebula, RCW 118 and G2.4+1.4 and around the stars WR 16 and WR 43. Combining our results with those of Miller and Chu (1993) and Paper I, 92% of the van der Hucht catalog of Wolf- Rayet stars have now been surveyed. Of the 145 Galactic WoIf-Rayet sta rs now surveyed, more than a quarter have associated ring nebula. Of t he 38 possible ring nebulae found in our surveys to date, 22 reside ar ound WN subtype Wolf-Rayet stars, 13 around WC stars, one around a tri plet of Wolf-Rayet stars and one around a WO star (WR 102). One ring e xists around a WN/WC star (WR 98). A bias toward rings being observed around W-R + OB binaries is noted. Such pairings are generally bright, and the detection of a ring around them may merely be a function of t heir combined luminosity. Several WoIf-Rayet stars are shown to be sur rounded by multiple rings (two or three) which suggests that a number of ejections of stellar material have taken place during their evoluti on.